Measurement accuracy improvement on high-precision sheet convexity using a laser scanning system

Junfeng Zhou; Jianping Tan

doi:10.1117/12.716168

13 October 2006 Measurement accuracy improvement on high-precision sheet convexity using a laser scanning system

Junfeng Zhou, Jianping Tan

Proceedings Volume 6280, Third International Symposium on Precision Mechanical Measurements; 628016 (2006) https://doi.org/10.1117/12.716168
Event: Third International Symposium on Precision Mechanical Measurements, 2006, Urumqi, China

Abstract

A scanning method to measure the convexity of thin-gauge roll castings is brought forward. With a laser scanner that is based on the difference measurement theory of a pair of laser beams, the thickness distribution is measured and the convexity is computed. In this paper, the system's structure with an equipment of high-precision sheet convexity measurement with lasers is introduced. The key technologies to improve the measuring precision of the measurement system are studied, which includes error avoidance and error restraint. In sheet thickness measurement systems with lasers, the vibration of the C-frame, which is excited by the vibration of the working environment, could cause the change of precision of the sensor position in the system, and affect the system's measuring precision. In this paper, by use of finite element method and modal analysis, the structure optimization of the C-frame is introduced. By the simulation and optimization, the natural frequencies are increased. At the same time, the key modes which can arouse sympathetic vibration are avoided. By optimization, the structure of the C-frame can be adapted to industrial environments and guarantees the measuring precision of the equipment. By use of the wavelet multi-resolution analysis method, the convexity measuring signal is analyzed. Errors in the convexity measuring signal are decomposed into single components and each of the components is in a different frequency channel and indicates a different error signal. After a restraining algorithm is used, the wavelet restoration of valid components of the measured signal is carried out and an error restraint for the convexity measurement is realized. The experiment shows that the methods studied are effective.

Citation Download Citation

Junfeng Zhou and Jianping Tan "Measurement accuracy improvement on high-precision sheet convexity using a laser scanning system", Proc. SPIE 6280, Third International Symposium on Precision Mechanical Measurements, 628016 (13 October 2006); https://doi.org/10.1117/12.716168

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KEYWORDS

Error analysis

Sensors

Wavelets

Laser systems engineering

Laser scanners

Data processing

Finite element methods

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